[PRQ#38333] Deletion Request for libzkgroup

AsamK [1] filed a deletion request for libzkgroup [2]: The upstream repo is archived and the functionality has been integrated into libsignal-client, for which another AUR package already exists. [1] https://aur.archlinux.org/account/AsamK/ [2] https://aur.archlinux.org/pkgbase/libzkgroup/